attribute.html

weka是机器学习和数据挖掘领域最有影响力的开源项目之一

<A NAME="addStringValue(java.lang.String)"><!-- --></A><H3>
addStringValue</H3>
<PRE>
public int <B>addStringValue</B>(java.lang.String&nbsp;value)</PRE>
<DL>
<DD>Adds a string value to the list of valid strings for attributes
 of type STRING and returns the index of the string.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>value</CODE> - The string value to add
<DT><B>Returns:</B><DD>the index assigned to the string, or -1 if the attribute is not
 of type Attribute.STRING</DL>
</DD>
</DL>
<HR>

<A NAME="addStringValue(weka.core.Attribute, int)"><!-- --></A><H3>
addStringValue</H3>
<PRE>
public int <B>addStringValue</B>(<A HREF="../../weka/core/Attribute.html" title="class in weka.core">Attribute</A>&nbsp;src,
                          int&nbsp;index)</PRE>
<DL>
<DD>Adds a string value to the list of valid strings for attributes
 of type STRING and returns the index of the string. This method is
 more efficient than addStringValue(String) for long strings.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>src</CODE> - The Attribute containing the string value to add.<DD><CODE>index</CODE> - the index of the string value in the source attribute.
<DT><B>Returns:</B><DD>the index assigned to the string, or -1 if the attribute is not
 of type Attribute.STRING</DL>
</DD>
</DL>
<HR>

<A NAME="addRelation(weka.core.Instances)"><!-- --></A><H3>
addRelation</H3>
<PRE>
public int <B>addRelation</B>(<A HREF="../../weka/core/Instances.html" title="class in weka.core">Instances</A>&nbsp;value)</PRE>
<DL>
<DD>Adds a relation to a relation-valued attribute.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>value</CODE> - The value to add
<DT><B>Returns:</B><DD>the index assigned to the value, or -1 if the attribute is not
 of type Attribute.RELATIONAL</DL>
</DD>
</DL>
<HR>

<A NAME="copy(java.lang.String)"><!-- --></A><H3>
copy</H3>
<PRE>
public final <A HREF="../../weka/core/Attribute.html" title="class in weka.core">Attribute</A> <B>copy</B>(java.lang.String&nbsp;newName)</PRE>
<DL>
<DD>Produces a shallow copy of this attribute with a new name.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>newName</CODE> - the name of the new attribute
<DT><B>Returns:</B><DD>a copy of this attribute with the same index</DL>
</DD>
</DL>
<HR>

<A NAME="formatDate(double)"><!-- --></A><H3>
formatDate</H3>
<PRE>
public java.lang.String <B>formatDate</B>(double&nbsp;date)</PRE>
<DL>
<DD>Returns the given amount of milliseconds formatted according to the
 current Date format.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>date</CODE> - the date, represented in milliseconds since 
                        January 1, 1970, 00:00:00 GMT, to return as string
<DT><B>Returns:</B><DD>the formatted date</DL>
</DD>
</DL>
<HR>

<A NAME="parseDate(java.lang.String)"><!-- --></A><H3>
parseDate</H3>
<PRE>
public double <B>parseDate</B>(java.lang.String&nbsp;string)
                 throws java.text.ParseException</PRE>
<DL>
<DD>Parses the given String as Date, according to the current format and
 returns the corresponding amount of milliseconds.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>string</CODE> - the date to parse
<DT><B>Returns:</B><DD>the date in milliseconds since January 1, 1970, 00:00:00 GMT
<DT><B>Throws:</B>
<DD><CODE>java.text.ParseException</CODE> - if parsing fails</DL>
</DD>
</DL>
<HR>

<A NAME="getMetadata()"><!-- --></A><H3>
getMetadata</H3>
<PRE>
public final <A HREF="../../weka/core/ProtectedProperties.html" title="class in weka.core">ProtectedProperties</A> <B>getMetadata</B>()</PRE>
<DL>
<DD>Returns the properties supplied for this attribute.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>metadata for this attribute</DL>
</DD>
</DL>
<HR>

<A NAME="ordering()"><!-- --></A><H3>
ordering</H3>
<PRE>
public final int <B>ordering</B>()</PRE>
<DL>
<DD>Returns the ordering of the attribute. One of the following:
 
 ORDERING_SYMBOLIC - attribute values should be treated as symbols.
 ORDERING_ORDERED  - attribute values have a global ordering.
 ORDERING_MODULO   - attribute values have an ordering which wraps.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>the ordering type of the attribute</DL>
</DD>
</DL>
<HR>

<A NAME="isRegular()"><!-- --></A><H3>
isRegular</H3>
<PRE>
public final boolean <B>isRegular</B>()</PRE>
<DL>
<DD>Returns whether the attribute values are equally spaced.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>whether the attribute is regular or not</DL>
</DD>
</DL>
<HR>

<A NAME="isAveragable()"><!-- --></A><H3>
isAveragable</H3>
<PRE>
public final boolean <B>isAveragable</B>()</PRE>
<DL>
<DD>Returns whether the attribute can be averaged meaningfully.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>whether the attribute can be averaged or not</DL>
</DD>
</DL>
<HR>

<A NAME="hasZeropoint()"><!-- --></A><H3>
hasZeropoint</H3>
<PRE>
public final boolean <B>hasZeropoint</B>()</PRE>
<DL>
<DD>Returns whether the attribute has a zeropoint and may be
 added meaningfully.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>whether the attribute has a zeropoint or not</DL>
</DD>
</DL>
<HR>

<A NAME="weight()"><!-- --></A><H3>
weight</H3>
<PRE>
public final double <B>weight</B>()</PRE>
<DL>
<DD>Returns the attribute's weight.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>the attribute's weight as a double</DL>
</DD>
</DL>
<HR>

<A NAME="setWeight(double)"><!-- --></A><H3>
setWeight</H3>
<PRE>
public void <B>setWeight</B>(double&nbsp;value)</PRE>
<DL>
<DD>Sets the new attribute's weight
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>value</CODE> - the new weight</DL>
</DD>
</DL>
<HR>

<A NAME="getLowerNumericBound()"><!-- --></A><H3>
getLowerNumericBound</H3>
<PRE>
public final double <B>getLowerNumericBound</B>()</PRE>
<DL>
<DD>Returns the lower bound of a numeric attribute.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>the lower bound of the specified numeric range</DL>
</DD>
</DL>
<HR>

<A NAME="lowerNumericBoundIsOpen()"><!-- --></A><H3>
lowerNumericBoundIsOpen</H3>
<PRE>
public final boolean <B>lowerNumericBoundIsOpen</B>()</PRE>
<DL>
<DD>Returns whether the lower numeric bound of the attribute is open.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>whether the lower numeric bound is open or not (closed)</DL>
</DD>
</DL>
<HR>

<A NAME="getUpperNumericBound()"><!-- --></A><H3>
getUpperNumericBound</H3>
<PRE>
public final double <B>getUpperNumericBound</B>()</PRE>
<DL>
<DD>Returns the upper bound of a numeric attribute.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>the upper bound of the specified numeric range</DL>
</DD>
</DL>
<HR>

<A NAME="upperNumericBoundIsOpen()"><!-- --></A><H3>
upperNumericBoundIsOpen</H3>
<PRE>
public final boolean <B>upperNumericBoundIsOpen</B>()</PRE>
<DL>
<DD>Returns whether the upper numeric bound of the attribute is open.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>whether the upper numeric bound is open or not (closed)</DL>
</DD>
</DL>
<HR>

<A NAME="isInRange(double)"><!-- --></A><H3>
isInRange</H3>
<PRE>
public final boolean <B>isInRange</B>(double&nbsp;value)</PRE>
<DL>
<DD>Determines whether a value lies within the bounds of the attribute.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>value</CODE> - the value to check
<DT><B>Returns:</B><DD>whether the value is in range</DL>
</DD>
</DL>
<HR>

<A NAME="main(java.lang.String[])"><!-- --></A><H3>
main</H3>
<PRE>
public static void <B>main</B>(java.lang.String[]&nbsp;ops)</PRE>
<DL>
<DD>Simple main method for testing this class.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>ops</CODE> - the commandline options</DL>
</DD>
</DL>
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